Performance validation check

Collect additional performance samples if performance was changed.

check_regression=OCL*
May be something like this:
```
    if (!has_next)
    {
        const ::testing::TestInfo* const test_info = ::testing::UnitTest::GetInstance()->current_test_info();
        std::string name = (test_info == 0) ? "" :
                std::string(test_info->test_case_name()) + "--" + test_info->name();

        if (!name.empty())
        {
            calcMetrics();
            double median_ms = metrics.median * 1000.0f / metrics.frequency;

            if (!perf_validation_results.empty())
            {
                ...
            }

            if (!has_next)
            {
                savePerfValidationResult(name, (float)median_ms);
            }
        }
    }
```